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there was a discussion on tar wiring and the decay and/or overheating of it, although i'm unable to find it...

here's a few shots of some old tar wiring that is also aluminum.

they're not the best pix here, but what i did is strip back two pieces

look closely, and you can see the neutral of one having taken on some overheated tar (it stripped harder)


~Sparky

[Linked Image from electrical-photos.com]

[Linked Image from electrical-photos.com]